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Project Plan: Snake Game (Day 24)

Metadata

Key Value
ID PP-001
CrossReference BC-001, SA-001, DICT-001, MIL-001, MIL-002, MIL-003, MIL-004, MIL-005, MIL-006
Language en
Domain it

Version History

Date Status Author Reviewer Change Commit
2026-10-13 Deprecated Jens Tirsvad Nielsen S01 Initial version; accepted by S01 (Product Owner) in chat on 2026-10-13 e004c34
2026-10-13 Accepted Jens Tirsvad Nielsen S01 Added MIL-006 (the screenshot): its schedule, scope coverage, dependency, a risk and open issues; accepted by S01 (Product Owner) in chat on 2026-10-13 pending

Purpose

This plan schedules the six milestones that deliver the Snake Game (Day 24) repository of BC-001. The repository starts from the finished main of 021-snake-game, which holds the snake game of days 20 and 21 with tests and documentation. The milestones therefore set up the repository, adopt that base, add continuous play and the high score of the day-24 lectures, store the high score in data.txt, and finish the repository with the README check and a wiki in three languages; a sixth milestone, added on 2026-10-13, adds a screenshot of the game. Each milestone is one gateway document, one branch and one pull request, so that every step is kept track of and reviewed before the next one starts.

Planning Assumptions

  • The phase starts 2026-10-14 and ends by 2026-10-25, which leaves two days of buffer after MIL-005. All dates are proposed and need the Product Owner's confirmation (see Open Issues). MIL-006 was added after MIL-005 was merged; it uses the two buffer days, so the end date does not move and no buffer remains.
  • Phase length: two days per milestone, sized for the spare time of S01, who owns every phase (SA-001).
  • The starting point is the finished main of 021-snake-game, which S01 pointed to in chat on 2026-10-13. The base is copied file by file, so each adopted file is a task, and every difference from the base is listed in the pull request.
  • One branch per milestone, named after it (mil-001-project-foundation and so on), and one pull request that closes the issues of that milestone with one Closes #N line each. The planning documents themselves are delivered on the branch plan-baseline.
  • S01 switched on autonomous mode in chat on 2026-10-13 (see AGENTS.md, Modes): S01's acceptance of this plan is the request, and the commit, the push, the pull request and its merge follow without further asking. The reviews are done by the assistant as stand-in for S01 and are not independent; each record says Mode: autonomous, not independent.
  • The plan gate is enabled for commits in this clone: a commit that changes src/ or tests/ needs a Task: MIL-NNN#N trailer for an accepted, reviewed milestone.
  • The tokens in .env are used only by commands that the assistant runs (repository description and topics, sync of issues); the project never imports, tests or tracks the file.

Gateway Schedule

Gateway Document Window Decision date Owner Stories Main deliverable Milestone
Project foundation MIL-001 2026-10-14 to 2026-10-15 2026-10-15 S01 None (see Open Issues) pyproject.toml, .gitignore, constants.py, README, Doxyfile, CI workflow, repository description and topics
Adopt the game MIL-002 2026-10-16 to 2026-10-17 2026-10-17 S01 None (see Open Issues) Snake, Food, Scoreboard, the main flow and python -m snake_game, with their tests
Continuous play and high score MIL-003 2026-10-18 to 2026-10-19 2026-10-19 S01 None (see Open Issues) Scoreboard.high_score and reset, Snake.reset, play without game over, with tests
High score file MIL-004 2026-10-20 to 2026-10-21 2026-10-21 S01 None (see Open Issues) High score read from and written to data.txt with with, robust against a missing or damaged file, with tests
Wiki and finish MIL-005 2026-10-22 to 2026-10-23 2026-10-23 S01 None (see Open Issues) Wiki in English, Danish and Bahasa Melayu; README checked against the finished game; end-to-end verification
Screenshot MIL-006 2026-10-24 to 2026-10-25 2026-10-25 S01 None (see Open Issues) A real screenshot of the running game at a score of 5, shown in the README and on the three wiki pages 
@startgantt
Project starts 2026-10-14
[MIL-001 Project foundation] starts 2026-10-14 and ends 2026-10-15
[MIL-002 Adopt the game] starts 2026-10-16 and ends 2026-10-17
[MIL-003 Continuous play and high score] starts 2026-10-18 and ends 2026-10-19
[MIL-004 High score file] starts 2026-10-20 and ends 2026-10-21
[MIL-005 Wiki and finish] starts 2026-10-22 and ends 2026-10-23
[MIL-001 Go/No-Go] happens 2026-10-15
[MIL-002 Go/No-Go] happens 2026-10-17
[MIL-003 Go/No-Go] happens 2026-10-19
[MIL-004 Go/No-Go] happens 2026-10-21
[MIL-005 Go/No-Go] happens 2026-10-23
[MIL-006 Screenshot] starts 2026-10-24 and ends 2026-10-25
[MIL-006 Go/No-Go] happens 2026-10-25
@endgantt

Scope Coverage

Business Case scope item Gateway
Adopting the finished game of the base: configuration, constants, workflow MIL-001
Adopting the finished game of the base: Snake, Food, Scoreboard, the main flow and the tests MIL-002
Day-24 lecture "High score": high_score attribute, reset instead of game_over, scoreboard text MIL-003
Day-24 lecture "Continuous play": no stop on collision; Snake.reset moves the old segments off the screen MIL-003
Day-24 lectures "Open, read and write files" and "Persist the high score": data.txt, with, conversion to int, write on new high score MIL-004
Robust file handling (missing, empty or damaged file) MIL-004
Constants in constants.py; src/, tests/, docs/ layout MIL-001, extended in MIL-003 and MIL-004
pyproject.toml, Python .gitignore, Doxyfile, README, continuous integration workflow MIL-001, README updated in MIL-002 to MIL-004 and finished in MIL-005
Repository description and topics MIL-001 (task 7), checked again in MIL-005
Wiki in English, Danish and Bahasa Melayu MIL-005
A real screenshot of the game in the README and on the wiki (objective 13) MIL-006

Dependencies

MIL-001 → MIL-002 → MIL-003 → MIL-004 → MIL-005 → MIL-006

A No-Go on a gateway returns it to S01 for rework and moves every later date by the same number of days; after MIL-006 no buffer day remains, so a No-Go on it moves the end date.

Plan Risks

Risk Impact Mitigation
The planning documents take longer to review than the work left on the game The first gateway slips Review BC-001, SA-001 and this plan together in one sitting; keep the milestones small
Author and reviewer are the same person (S01) A review can miss a defect Use the QC checklists and the pull request as the second look; recorded in BC-001
The git host has no Actions runner The CI workflow is never executed Run the same commands locally before each pull request
Lecture details are only available as the summaries in the request The game differs from the video S01 compares the finished game with the video at the MIL-003 and MIL-004 Go/No-Go
The sync matches issues by title, so a title used twice overwrites an issue A task disappears from the board Every task title is unique across all milestones; check before each --apply
The base is a copy of another repository A later fix reaches only one of them Out of scope by decision (see BC-001); each pull request lists the differences from the base
The screenshot is a capture of a real window, which needs a display It cannot be repeated in CI or on another machine It is taken once on S01's machine with a one-off script outside the repository and committed as a file; a capture tool is out of scope
The wiki publish workflow needs a secret of the organization The wiki stays empty Reported to S01, never worked around; the pages are files in wiki/ and are not lost

Open Issues

  • Dates: the start date, milestone lengths and the end date 2026-10-25 are proposed and not given by the Product Owner; confirm or replace them.
  • Product Owner (PO) language: S01 chose English on 2026-10-13; en is recorded in docs/artifact-registry.md.
  • Stakeholder levels: the Power and Interest levels of S02 and S03 in SA-001 are proposals, taken over from 021-snake-game.
  • Starting point: the finished main of 021-snake-game is the base, as S01 pointed to it in chat on 2026-10-13. Confirm that it is the intended base and not a rebuild from 020-snake-game.
  • Repository address: the request names https://git.tirsystem.com/Tirsvad-Udemy-100_days_of_code (underscores), which is not the repository of origin (Tirsvad-Udemy-100-days-of-code/024-snake). S01 chose origin in chat on 2026-10-13; description and topics are set there.
  • Repository description and topics: the proposed text is in MIL-001; S01 confirms it by accepting this plan.
  • "Python greater than 3.13": read as Python 3.13 or newer (requires-python = ">=3.13"), as in 021-snake-game. Confirm.
  • README template: the Product Owner's README template is used. It differs from framework/templates/README-template.md, so framework/scripts/check-readme.sh stays off.
  • Place of data.txt: the lecture opens the plain name data.txt, which is resolved against the current working directory, so the game started from another folder uses another file. MIL-004 keeps the lecture's name as the default and makes the path a parameter; the alternative is a fixed place per user. Confirm. data.txt is listed in .gitignore, because it is the player's own state.
  • Robust file handling: the lecture assumes data.txt exists and holds a number. The plan adds a fallback to 0 (objective 6 of BC-001) and creates a missing file. Confirm, or ask for the lecture's version without it.
  • Mail merge project: the request lists the personalised-letters project of day 24. It is a separate program and out of scope here (see BC-001); it can get its own repository.
  • Display-free tests: Scoreboard inherits from Turtle, so its tests install a fake turtle module, as in 021-snake-game.
  • No user story or use case: the tasks are written as build and check steps, so they are plain technical tasks. If the player's goal should be modelled, add a Use Case Diagram, a user story and a use case and reference them from the task rows.
  • Governance and traceability matrix: GOV and TM do not exist yet in this project. Decide whether to create them; the plan proceeds without them and records each review as an RC-*. The Domain Dictionary DICT-001 was added on 2026-10-13 so that criterion 5 of QC-LANG-001 can be checked.
  • Screenshot (added 2026-10-13): S01 asked for a screenshot of the game in the README and on the wiki. MIL-006 takes it with a one-off script outside the repository: the real game window at a score of 5, with a high score of 12 on the scoreboard that comes from a temporary data.txt (S01's own data.txt is not used). The score of 5 and the high score of 12 are assumptions that S01 confirms by accepting this plan. The wiki pages refer to the file on main, so the pages show it as soon as the merge is published.
  • Diagram check: the Gantt chart above was not rendered because no PlantUML server is configured (PLANTUML_URL); render it before the review.
  • Sync: sync-project.sh --apply is run with GITEA_TOKEN from the personal .env after the plan is accepted, as in 021-snake-game; the sync matches issues by title.
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